scienceTo get you started: It looks like you want the equation for potassium and sulfur reacting to form potassium sulfide, that is potassium + sulfur ---> potassium sulfide Write this down using the chemical symbols for each. You will need to find the number of valence electrons ...
August 31, 2010

ChemistryHow would you make 500 mL (0.500L) of a 0.200 M HCl solution from stock concentrate of 12 M HCl?
June 8, 2010

ChemistryHow would you make 500 mL (0.500L) of a 0.200 M HCl solution from stock concentrate of 12 M HCl?
June 8, 2010

ChemistryHow would you make 500 mL (0.500L) of a 0.200 M HCl solution from stock concentrate of 12 M HCl?
June 8, 2010

algebratogether, jareds age and his daughters age total 100. but jareds grandfather is 70 years older than him. how old is jareds grandfather?
May 13, 2010

MATH13. A tree casts a shadow of 17 ft. The angle of elevation from the tip of the shadow to the top of the tree is 68°. To the nearest foot, what is the height of the tree? 14. The angle of depression of a diver from the boat is 34°, and the diver is 367 ft deep. To the ...
March 8, 2010

MathTwo cars start from the same place and travel in the same direction. If one car travels at 60 miles per hour and the other travels at 45 miles per hour, in how many hours will they be 60 miles apart?
February 10, 2010

Economics4.20 Diamonds clearly satisfy less important needs than water, which is essential to life. Yet according to market prices, the essential commodity, water, is worth less than the less essential commodity, diamonds. Why would a vital com-modity such as water sell for so much ...
January 26, 2010

us.historyWhy should Americans in the 1920s have shown greater concern for their future? then it tells me to note three things that were,or might have been,seen as "clouds in the blue skies of prosperity" i noticed someone has the answer but mines is very differently mine is a...
January 19, 2010

Law and EthicsThe problem I am having is that the instructions say to use the AMA website for your research and to find ethical opinions. The hint say: ethical opinions begin with "e". I am not able to find those using their search bar. Any suggestions? I am afraid if I don't ...
July 20, 2008

physics By "see" I meant that I had checked my answer on the internet to see if I was correct in thinking that multipying the charge of an electron, charge of a proton, and k would yield the electrical force between an electron and proton. My answer was 23.10 x 10^-9 which ...
March 29, 2008

physicsI keep seeing 7.620497955 as the electrical force between a proton and electron but when I multiply (8.99 x 10^9)(1.602 x 10^-19)-(1.602 x 10^-19)/(10^-10)2 I get a diffrent answer. Am I multiplying the wrong numbers?
March 29, 2008

PhysicsA hot-air balloonist, rising vertically with a constant velocity of magnitude v = 5.00 m/s, releases a sandbag at an instant when the balloon is a height h = 40.0 m above the ground. After it is released, the sandbag is in free fall. For the questions that follow, take the ...
September 13, 2007

GeographyWhat kinds of problems might exist in the Western Cordillera region for farming and transportation? Please help. thanks. Thank you for using the Jiskha Homework Help Forum. Each time you post try to give the complete frame of reference. When you just say "Western ...
April 12, 2007

PhysicsOne end of a uniform meter stick is placed against a vertical wall. The other end is held by a lightweight cord that makes an angle, theta, with the stick. The coefficient of static friction between the end of the meter stick and the wall is 0.390. A. what is the maximum value...
April 3, 2007

ChemistryFind the pH during the titration of 20.00 mL of 0.2380 M butanoic acid, CH3CH2CH2COOH (Ka = 1.54 10-5), with 0.2380 M NaOH solution after the following additions of titrant. (a) 0 mL Ive got the answer of 2.72 (b) 10.00 mL Ive got the answer of 4.81 I'm lost from here......
April 2, 2007

PhysicsThe Spinning Figure Skater. The outstretched hands and arms of a figure skater preparing for a spin can be considered a slender rod pivoting about an axis through its center . When his hands and arms are brought in and wrapped around his body to execute the spin, the hands and...
March 27, 2007

PhysicsA woman with a mass of 50kg is standing on the rim of a large disk that is rotating at an angular velocity of .50 rev/s about an axis through its center. The disk has a mass of 110kg and a radius of 4.0m. Calculate the magnitude of the total angular momentum of the woman-plus-...
March 27, 2007

PhysicsForces F1=7.50N and F2=5.30N are applied tangentially to a wheel with radius 0.330 m. What is the net torque on the wheel due to these two forces for an axis perpendicular to the wheel and passing through its center? It depends upon whether or not the forces F1 and F2 are both...
March 27, 2007

PhysicsA hollow, spherical shell with mass 2.00 kg rolls without slipping down a slope angled at 38.0 degrees. (a) Find the acceleration, the friction force, and the minimum coefficient of fricition needed to prevent slipping. You will find the moment of inertia (I) of a hollow ...
March 27, 2007

PhysicsA cord is wrapped around the rim of a wheel .250 m in radius, and a steady pull of 40.0 N is exerted on the cord. The wheel is mounted on frictionless bearings on a horizontal shaft through its center. The moment of inertia of the wheel about this shaft is 5.00kg*m^2. Compute ...
March 27, 2007

chemistrywhat is the molecular geometry and bond angles of CF2Cl2? Is there any reason to suspect this won't be tetrahedral with bond angles of 109.5? The difference in electronegativity between F and Cl would be expected to alter the angles somewhat.
February 26, 2007

Science help plz1. In an experiment, you remove the nucleus from an amoeba. Predict what will happen to the amoeba and explain why. plz help What does the nucleus do? Those functions would be absent. Since this is not my area of expertise, I searched Google under the key words "amoeba ...
October 16, 2006

Math help plz ASAP.Rationalize each denominator. 6 + square root of 2 ____________________________ square root of 3 PLZ HELP..dont kno how to do this question.plz explain..thanks You have (6 + sqrt(2))/sqrt(3) multiply that by sqrt(3)/sqrt(3) to get [(6 + sqrt(2))*sqrt(3)]/3 and simplify To ...
October 15, 2006